You can create VPN tunnels between organization vDC networks on the same organization, between organization vDC networks on different organizations, and between an organization vDC network and an external network.

vCloud Director does not support multiple VPN tunnels between the same two edge gateways. If there is an existing tunnel between two gateways and you want to add another subnet to the tunnel, delete the existing VPN tunnel and create a new one that includes the new subnet.